NEET2022Physics-Optics
NEET 2022 Physics Lenses MCQ Question
Type: MCQ-numerical-Medium-Class 12
A biconvex lens has radii of curvature, 20 cm each. If the refractive index of the material of the lens is 1.5, the power of the lens is:
A
+5D
B
infinity
C
+2D
D
+20D
Correct Answer
Option A
Detailed Explanation
The power of a lens is given by the formula P = (n - 1)(1/R₁ - 1/R₂). For a biconvex lens with equal radii of curvature, R₁ = R₂ = 20 cm, and n = 1.5, the power is calculated as +5D.
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